Available on Xbox Live today, Escalation, the second content pack for Call of Duty Black Ops, was created by game developer, Treyarch, for a zombie experience gamers have never played. The studio started by crafting a storyline inspired by iconic Night of the Living Dead Writer/Director, George Romero, the Grandfather of the Zombie himself who will also star in the level, and then went on to reveal that famed horror and action stars Robert Englund (Freddy Krueger), Sarah Michelle Gellar (Buffy the Vampire Slayer), Michael Rooker (Henry: Portrait of a Serial Killer) and Danny Trejo (Machete) also joined the cast. The Call of Duty®: Black Ops: Call of the Dead zombie level includes four all new multiplayer maps to make up the second content pack, Escalation, for the record-setting game Call of Duty: Black Ops.